Circuit breaker for high voltage currents, has thermal blast chamber that communicates with expansion space and valve that opens when pressure in chamber is greater than particular threshold

摘要

The circuit breaker has a thermal blast chamber (4) that communicates with an expansion space (15) through an evacuation passage (10) that is shut off by a valve (10). The chamber (4) communicates with a breaking space through a throat (3) of a nozzle (3). The valve opens when the pressure in the chamber is greater than a particular threshold to evacuate the pressurized gas from the chamber. The evacuation passage is formed in the nozzle and defines a circular volume within the thickness of the nozzle.